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Q. No.Assertion(A): Parturition is induced by a complex neuroendocrine mechanism involving cortisol, estrogen and oxytocin.
Reason(R): The signals for parturition originate from fully developed foetus and placenta which induce foetal ejection reflex.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Fetal Development & Parturition |
54%
From NCERT
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Read the following statements :
(i) Both estrogen and progesterone are necessary for ovulation to take place
(ii) Estrogen tends to inhibit the secretion of FSH from the anterior pituitary gland
(iii) Fertilization of the ovum by the spermatozoan normally takes place in the uterus
(iv) Progesterone production is largely under the control of LH
(v) Throughout the part of menstrual cycle that follows ovulation, there is slight rise in body temperature
How many of the above statements are correct?
1. Two
2. Three
3. Four
4. One
(i) Both estrogen and progesterone are necessary for ovulation to take place
(ii) Estrogen tends to inhibit the secretion of FSH from the anterior pituitary gland
(iii) Fertilization of the ovum by the spermatozoan normally takes place in the uterus
(iv) Progesterone production is largely under the control of LH
(v) Throughout the part of menstrual cycle that follows ovulation, there is slight rise in body temperature
How many of the above statements are correct?
1. Two
2. Three
3. Four
4. One
Subtopic: Introduction to Menstrual Cycle: 1 | Introduction to Menstrual Cycle: 2 | Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase | Fertilization: Part 1 | Fertilization: Part 2 | Fertilization | Menstrual Cycle |
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Assertion (A): In human males, 50 percent of sperms carry the X chromosome while the other 50 percent carry the Y.
Reason (R): Human males have XY sex chromosomes.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason (R): Human males have XY sex chromosomes.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Sex Determination in Humans |
84%
From NCERT
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Assertion(A): Ootid is haploid.
Reason(R): Ovum is haploid.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason(R): Ovum is haploid.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: oogenesis |
68%
From NCERT
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Assertion(A): In a menstrual cycle secretory phase is followed by follicular phase.
Reason(R): Secretory phase is called follicular phase.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason(R): Secretory phase is called follicular phase.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase | Menstrual Cycle |
70%
From NCERT
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| Assertion(A): | The inner cell mass of blastocyst differentiates into outer and inner layer just before implantation. |
| Reason(R): | The outer layer of blastocyst forms the embryo. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Implantation : Part 1 | Implantation : Part 2 | Embryonic Development till Gastrulation | Fetal Development & Parturition | Implantation |
64%
From NCERT
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| Assertion(A): | As a result of ovariectomy, menstrual cycle may stop. |
| Reason(R): | Ovarian hormones induce menstrual cycle. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase | Menstrual Cycle |
64%
From NCERT
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Assertion(A): hCG, and hPL are produced in women only during pregnancy.
Reason(R): These hormones are produced by placenta.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason(R): These hormones are produced by placenta.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Implantation : Part 1 | Implantation : Part 2 | Fetal Development & Parturition | Implantation |
83%
From NCERT
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| Assertion(A): | The menstrual flow occurs due to the breakdown of endometrial lining of uterus and its blood vessels. |
| Reason(R): | Rapid fall in the level of progesterone takes place due to degeneration of corpus luteum. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase | Menstrual Cycle |
69%
From NCERT
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| Assertion(A): | Menstrual cycle stops during pregnancy. |
| Reason(R): | Stoppage of menstrual cycle confirms pregnancy.a |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase | Menstrual Cycle |
56%
From NCERT
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